The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 1980
Filed:
Mar. 16, 1978
Jack R Claycomb, Houston, TX (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
A measuring while drilling tool is disclosed. The preferred embodiment incorporates an outer shell which is connected in a drill string above the drill bit and among the drill collars. The apparatus utilizes mud pressure variations to pump oil with a piston to energize a closed hydraulic circuit. The oil is delivered via a distribution and manifold system to first fill and scan five hydraulic signals sequentially. The sequential scan of the five hydraulic signals is then conveyed to an output mechanism comprising a choke which is placed in the lower end of the tool which choke varies the mud throughput, thereby varying upstream pressure in the mud circuit, forming an output which can be detected at the surface.